Saw guard



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Patented Feb. 10, 1925.

"UNITED STATES ANDREW FLOHR, OF COLORADO SPRINGS, COLORADO.

SAW GUARD.

Application led October 20, 1923. Serial No. 669,731.

To all whom t may concern.:

Be it known thatI, ANDREW FLoHR, a citizen of the United States,residing at Colorado Springs, county of El Paso, and State of Colorado,have invented certain new and useful Improvements in Saw Guards; and Ido declare the following to be a full, clear, and eXact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the characters of reference markedthereon, which form a part of this specification.

This invention relates to saw guards and has special relation to guardsfor circular saws.

Among the tools employed in woodworking, it may safely be said that thecircular saw, which is so extensively employed, is responsible for thegreatest number of serious accidents. In order to diminish the accidentsdue to this machine, it has been proposed that the same shall beprovided with some guard means which will make it impossible for theoperator to get his hands or fingers into such position that they areinjured by the saw. It is essential, however, that the guard shall be sodesigned and constructed that it will not appreciably diminish the`usefulness of the saw, as it is primarily intendedfor service and anyguard that interferes with its successful and eiiicient operation is, ofcourse, objectionable.

It is the object of this invention to produce a guard that shall be soconstructed and designed that it will keep the saw covered so fully andcompletely that the operator, unless he is guilty of extreme negligence,will be fully protected from ininterfere with the proper operation-0f`the saw. i

The above and other objects, which will appear as the descriptionproceeds, are obtained by means .of a construction which I will nowproceed to describe in detail, reference being had for this'purpose tothe accompanying drawings in which my invention is shown in itspreferred form, and in which:

Fig. 1 is a vertical section taken on line 1 1, of Fig. 2, with aportion of the sup porting arm broken away;

Fig. 2 is a plan view of a saw table with my guard in place thereon, apart of the view being shown as a section taken on line Fig. 4 is asection taken on line 4 4, of'

Fig. 2;

Fig. 5 is an end elevation looking in the directionof the arrow 5 inFig. 2; and

Fig. 6 is a view looking in the direction of the arrows 6 6, in Fig. 2.

The same reference characters will be used to designate the same partsthroughout fthe several views.

Numeral 1 represents the table of a circular saw machine and 2 the saw'blade, which is operatively connected thereto. I have not gone intodetail concerning the construction of the sawing machine, as this hasnothing to do with my invention, the saw and the saw table being shownmerely for the purpose of better describing the guard which forms thesubject matter of this application. V

To the edge of the table on the right of the saw blade 2, I secure abracket 3 which has a pair of spaced stationary jaw members 4 and 5. Tothe lower one (5) of these jaws, there is threadedly connected a pair ofclamping screws 6 by means of which the bracket 3 is firmly secured tothe table. Any other means for securing the bracket in place may beemployed, but the one described has proven -to be both practical andetlicient. The upper end of the bracket 3 is provided with spacedjournals 7 and 8 for the reception of the trunnions 9 and 10, which arenon-rotatably secured to the end of arm 11. Trunnion 10 has severalratchet teeth on its outer surface and these are so located that theycooperate with the pawl 12 which is impelled towards the trunnion by theaction -1 of the spring 13. The purpose of the `pawl and ratchetarangement is to hold thearm 1.1 in the desired relation with respect tothe tables. The normal or operative position of arm 11 is shown in fulllines in Fig. 1 and i' i the inoperative position being indicated'by adot and dash line. Arm 11 is hollowand has telescopically connectedthereto a cylindrical member 4, which has on lone side a longitudinalgroove 15 `for the reception movement. `Secured to the `outer end of CJImember 1st is a rectangular bar 18 from which the remaining parts of theguard are supported. Al transverse bar 19 is Ysecured to the bar 18 bymeans of bolts 20. Supported from bolts Q0 are a plurality of dogs 21whose function it is to engage the npper surface of the material sawedin the manner shown in Fig. 5 so as to prevent the same from beingthrown from the table b v the action of the saw. As shown in thedrawings l preferably employ two sets of dogs, each set consisting ofthree dogs of different lengths so as to most effectively cooperate witha variety of different thicknesses of material. Bar 19 l as a hole nearits rear end, for the reception of a bolt. QS? which serves as' a pivotfor the movable bar 2&1. )i ferrule 25 spaces the movable bar ill fromthe stationary transverse bar 19. To the front. or free end of themovable bar, l secure a guard member 2G which is substantiallytriangular in shape with its side 27 curved on the arc of a circle whosecenter is boltI 23. The guard member 26 is ,firmly secured to the freeend of the movable bar 24 by means of bolts or rivets 2S. The curvedside 27 has one groove 29, which receives the front end of thestationary bar 19, which serves as a guide for the guard as it swingsabout its pivot 28. The guard Q6 is of such size that when its lowercorner rests upon the upper surface of the table7 the moin able bar 24-is substantially horizontal, in the manner shown in Fig. 4t, althoughthis is obviously not a necessary condition. The parts are so locatedthat the bar 19 lies directly over the saw so that in case any portionsof the latter should break and liy off, they will strike the lower edgeof the. bar. A spreader 30 is fastened to bar19 and has itsY lower endextending into the saw slot in the table. Movable bar 24 extends to therear of the pivot. Q3 and is provided with an adjustable counterweight31 which can be fastened in such a position that it permits the guard tobe moved upwardly with but little effort. To protect the saw from theside, 1 provide a sector-shaped sheet metal guard 32 that is pivoted at28, the arcuate end 33' extending into a groove 34 in the arcuateportion 2T of the guard 26. Guard or shield member 32 may be raised intothe position shown by dotted lines in Fig. 5 whenever it is necessary todo so. The upper edge of the guard 32 is bent over to one side in themanner indicated by number 35. This odge forms a stop for the sawdustand prevents it from being thrown into the face of the operator. rl`hestationary bar 19 has two slots 37 lto which the spreader securing bolts86 pass.

The operation of my device is as followsz- The parts being assembled inthe mannerabove' described7 are secured to the right hand edge ofthetable and adjusted so that the spreader 30 enters the saw slot to therear of the saw. This brings the stationary transverse bar 19 directlyabove the saw blade. The counter-weight 31 is then adjusted to such aposition that the guard member 2G rests lightly on the upper surface ofthe table. The material to be sawed is shoved under the guard member andagainst the saw7 the guard rising and resting on trie upper surface ofthe work in the manner shown in Fig. 5. The dogs Z1 slid(x the uppersurface of the work and prevent its withdrawal. ldlhen, for: any reason`it is found desirable to move the guard out of the way, it can be raisedas indicated .in Fig. 1 and will remain in raised position by means ofthe dog` 112. lf. for any reason, it is found desirable to move. theguard 32. this can readily be done, as it is pivoted at 253 and slidablein groove it! so that it can be moved to the position shown by dash linein Fig. 5.

Having now described my invention. what l claim as new is:

1. 1n combination a saw table, a saw rotatably mounted thereon, abracket secured to one side of said table, an arm pivoted to saidbracket so as to swing in a plane suly stantially perpendicular to theplane of the saw.Y a transverse. bar having a member extending:therefrom at right angles, said member being slidably connected to thearm so as to permit the transverse bar to be adjusted to positions atvarious distances from the pivot of the arm, said transverse bar memberlying in a plane which coincides with the plane of the saw, a second barpivota ly connected to said transverse bar at a point to the rear of theaxis of the saw so as to be movable in a plane parallel with the planeof the saw7 and a guard member connected to the forward free end of saidbar, said guard member having a groove which receives one end of thetransverse bar whereby the gnard member is guided.

2. A guard for circular saws comprising. in combination. a bracketadapted to be secured to one edge of a saw table7 an arm pivotallyconnected to the upper end of said bracket, a bar carried by said armand extending transversely thereof in a plane substantially' parallelwith the pivot. one end of said transverse bar having a pivot attachedthereto, a bar oscillatively mounted on said pivot, a guard membersecured to the free end of said bar, guide means con'lprising a groovein said gnard member which receives one end of the transverse bar7 and asecond guard member comprising a piece of sheet metal pivotally mountedVon said pivot, said first guard member having a grooveA for thereception of the free end of said second guard member.

8. A guard for circular saws comprising. in combination, a bracketadapted to be secured to one edge of a saw table, an arm pivot-allyconnected to the upper end of said bracket, a bar carried by said armand extending transversely thereof in a plane substantially parallelWith the pivot, one end of said transverse bar having a pivot attachedthereto, a bar oscillatively mounted on said pivot, a guard membersecured to the free end of said bar, guide means comprising a groove insaid guard member which receives one end of the transverse bar, a secondguard member comprising a piece of sheet metal pivotally mounted on saidpivot, said first guard member having a groove for the the reception ofthe free end of said second guard member, said se; ond guard memberhaving its upper edge bent at an angle to the main body'portion thereof,and means for holding said arm in adjusted relation to the bracket, saidmeans comprising a pavvl carried by the bracket.

il. In combination7 a saw table, a circular sav7 blade rotatably mountedthereon, a bracket member secured to the table at a point spaced fromthe side of the saw, an arm pivotally connected to said bracket, atransverse bar having a member extending therefrom at right angles, saidmember being adjustably connected to said arm, a plurality of paWls ofvarious lengths pivotally connected to said transverse arm, a second armpivotalily connected to one end of the transverse arm and movable in aplane parallel With the plane of the transverse arm, said last planebeing substantially coincident with the plane of the saw blade, a guardmember secured to the end of the second arm, said guard memberprojectingbelow the bar and resting on the top of the table when the sawis inoperative, said guard having a groove adapted to receive one end ofthe transverse bar for the purpose of guiding the guard, a second guardmovably connected with said second arm, and means for guiding saidsecond guard.

In testimony whereof I affix my signature.

ANDREW FLOHR.

